Achieve Damascus steel style with Cycles
Final



Node setup

Setup is fairly easy to understand. We will use only Wave Texture with Distortion controlled by vector driven by Color Ramp. Then we will use output of this for Roughness in Principled BSDF.

First Color Ramp (left one) can be used to control how many stripes should be on bottom of the mesh and blend between stripes and pattern. Black is straight, white distorted. Second one controls Roughness value and here colors are important. Black is shiny, white is matte. 



Output of the texture



Final with UV mapping and mask for blade